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给出以下代码片段，请问以下哪些表达式的结果为true?Double d1=new Double (10.0);Double d2=new Double (10.0);int x = 10;float f=10.0f;
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给出以下代码，请问该程序的运行结果是为什么？public class Example {public static void main(String args[]){String s1 = “abc”;String s2 = “abc”;if(s1==s2)System. out. println("1");elseSystem . out . println("2") ;if (s1 . equals (s2))System . out . println("3") ;elseSystem . out . println("4") ;}}请选择所有正确答案：
给出以下代码，请问该程序的运行结果是什么？public class Example{public static void main (String args [] ) {String s1 = "abc";String s2 = new String("abc");if (s1 == s2)System . out . println("1");elseSystem . out . println("2");if (s1 . equals (s2))System . out . println("3");elseSystem . out . println("4");}}
给出以下代码,请问该程序的运行结果是什么?class Tree {}class Pinc extends Tree{}class Oak extends Tree{}public class Forest {public static void main (String [] args){Tree tree = new Pinc();if (tree instanceof Pinc)System. out. printin (“Pinc”);if (tree instanceof Tree)System. out. printin (“Tree”);if (tree instanceof Oak);System. out. printin (“Oak”);elseSystem. out. println (“Oops”);}}
给出以下代码,请问以下哪些选项会抛出NullPointerException异常来?String s=null;
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